Control method and brake system

Abstract

A control method and a brake system are provided. The method includes: when a vehicle moves downhill from a stationary state, obtaining a stroke of a brake pedal in the vehicle, and when the stroke of the brake pedal is greater than a first threshold, controlling the vehicle to brake with a first braking force, for a vehicle speed of the vehicle to be within a target vehicle speed range. In this way, when the vehicle starts to go downhill from the stationary state, a driver may control the vehicle speed of the vehicle by depressing the brake pedal, to effectively avoid a forward surge of the vehicle, and implement stable starting of the vehicle, so as to effectively improve safety of the vehicle.

1 . A control method, wherein the method comprises:
 based on a vehicle moving downhill from a stationary state, obtaining a stroke of a brake pedal in the vehicle, wherein the stroke of the brake pedal represents a degree of depressing the brake pedal by a driver; and   based on the stroke of the brake pedal being greater than a first threshold, controlling the vehicle to brake with a first braking force, for a vehicle speed of the vehicle to be within a target vehicle speed range.   
     
     
         2 . The method according to  claim 1 , wherein the first braking force is determined based on a second braking force of the vehicle being stationary and a slope of a hill on which the vehicle is currently located. 
     
     
         3 . The method according to  claim 2 , wherein a larger slope of the hill on which the vehicle is currently located indicates a slower decrease of the first braking force. 
     
     
         4 . The method according to  claim 2 , wherein the method further comprises:
 based on the stroke of the brake pedal being zero, controlling the vehicle to brake with the second braking force, for the vehicle to remain stationary.   
     
     
         5 . The method according to  claim 1 , wherein before the controlling the vehicle to brake with a first braking force, the method further comprises:
 receiving a first instruction, wherein the first instruction indicates to enable a hill descent control function of the vehicle, and the hill descent control function is used to adjust a braking force of the vehicle in a downhill scenario of the vehicle; and   enabling the hill descent control function in response to the first instruction.   
     
     
         6 . The method according to  claim 5 , wherein the first instruction is a human-machine interaction instruction, or the first instruction is an instruction from an intelligent driving system or an assisted driving system. 
     
     
         7 . The method according to  claim 1 , wherein the method further comprises:
 based on a first condition being met, adjusting the first braking force to zero, wherein   the first condition comprises at least one of the following: a tail of the vehicle deviates from a current traveling direction of the vehicle, a throttle opening degree of the vehicle is greater than a second threshold, or a caliper in an electrical park brake (EPB) system of the vehicle is clamped.   
     
     
         8 . A brake system, comprising a control unit, a brake pedal, a pedal stroke sensor, and a brake actuator, wherein the brake pedal is connected to the pedal stroke sensor, and the control unit is connected to both the pedal stroke sensor and the brake actuator;
 the pedal stroke sensor is configured to: based on a vehicle moving downhill from a stationary state, obtain a stroke of the brake pedal, wherein the stroke of the brake pedal represents a degree of depressing the brake pedal by a driver; and   the control unit is configured to: based on the stroke of the brake pedal being greater than a first threshold, control the brake actuator to complete a braking operation of the vehicle with a first braking force, for a vehicle speed of the vehicle to be within a target vehicle speed range.   
     
     
         9 . A control apparatus, comprising at least one processor, wherein the at least one processor is coupled to a memory, the memory stores program instructions, and the at least one processor is configured to execute the program instructions to implement a method comprising:
 based on a vehicle moving downhill from a stationary state, obtaining a stroke of a brake pedal in the vehicle, wherein the stroke of the brake pedal represents a degree of depressing the brake pedal by a driver; and   based on the stroke of the brake pedal being greater than a first threshold, controlling the vehicle to brake with a first braking force, for a vehicle speed of the vehicle to be within a target vehicle speed range.   
     
     
         10 . (canceled) 
     
     
         11 . The system according to  claim 8 , wherein the first braking force is determined based on a second braking force of the vehicle being stationary and a slope of a hill on which the vehicle is currently located. 
     
     
         12 . The system according to  claim 11 , wherein a larger slope of the hill on which the vehicle is currently located indicates a slower decrease of the first braking force. 
     
     
         13 . The system according to  claim 11 , wherein the control unit is further configured to:
 based on the stroke of the brake pedal being zero, control the vehicle to brake with the second braking force, for the vehicle to remain stationary.   
     
     
         14 . The system according to  claim 8 , wherein the control unit is further configured to:
 receive a first instruction, wherein the first instruction indicates to enable a hill descent control function of the vehicle, and the hill descent control function is used to adjust a braking force of the vehicle in a downhill scenario of the vehicle; and   enable the hill descent control function in response to the first instruction.   
     
     
         15 . The system according to  claim 14 , wherein the first instruction is a human-machine interaction instruction, or the first instruction is an instruction from an intelligent driving system or an assisted driving system. 
     
     
         16 . The system according to  claim 8 , wherein the control unit is further configured to:
 based on a first condition being met, adjust the first braking force to zero, wherein   the first condition comprises at least one of the following: a tail of the vehicle deviates from a current traveling direction of the vehicle, a throttle opening degree of the vehicle is greater than a second threshold, or a caliper in an EPB system of the vehicle is clamped.   
     
     
         17 . The apparatus according to  claim 9 , wherein the first braking force is determined based on a second braking force of the vehicle being stationary and a slope of a hill on which the vehicle is currently located. 
     
     
         18 . The apparatus according to  claim 17 , wherein a larger slope of the hill on which the vehicle is currently located indicates a slower decrease of the first braking force. 
     
     
         19 . The apparatus according to  claim 17 , wherein the method further comprises:
 based on the stroke of the brake pedal being zero, controlling the vehicle to brake with the second braking force, for the vehicle to remain stationary.   
     
     
         20 . The apparatus according to  claim 9 , wherein before the controlling the vehicle to brake with a first braking force, the method further comprises:
 receiving a first instruction, wherein the first instruction indicates to enable a hill descent control function of the vehicle, and the hill descent control function is used to adjust a braking force of the vehicle in a downhill scenario of the vehicle; and   enabling the hill descent control function in response to the first instruction.   
     
     
         21 . The apparatus according to  claim 9 , wherein the method further comprises:
 based on a first condition being met, adjusting the first braking force to zero, wherein   the first condition comprises at least one of the following: a tail of the vehicle deviates from a current traveling direction of the vehicle, a throttle opening degree of the vehicle is greater than a second threshold, or a caliper in an EPB system of the vehicle is clamped.